A microscope has a 12.5x eyepiece and a 57.3x objective 22.6 cm apart. Total mag

Question

A microscope has a 12.5x eyepiece and a 57.3x objective 22.6 cm apart. Total magnification is 716 and the focal length of the eyepiece lens is 2 cm. What is the focal length of the objective lens? Where must the object be for a normal relaxed eye to see it in focus? A microscope has a 12.5x eyepiece and a 57.3x objective 22.6 cm apart. Total magnification is 716 and the focal length of the eyepiece lens is 2 cm. What is the focal length of the objective lens? Where must the object be for a normal relaxed eye to see it in focus? A microscope has a 12.5x eyepiece and a 57.3x objective 22.6 cm apart. Total magnification is 716 and the focal length of the eyepiece lens is 2 cm. What is the focal length of the objective lens? Where must the object be for a normal relaxed eye to see it in focus?

Explanation / Answer

Me = 25/fe

Me = 25/12.5

Me = 2

distance d = S' + fe

S' = 22.6 -2 = 20.6

Magnification M = S'/S

M = 20.6/57.3

M = 0.359
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1/fo = 1/0.359 + 1/20.6

fo = 0.352 m

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object must be placed = 0.352 m

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